Several molecular studies have been conducted on northeastern Atlantic and Mediterranean patellid limpets, but Algerian specimens have never been included in these studies. This work intends to fill this gap and characterize populations of different Patella species inhabiting the Algerian coasts of Oran, clarifying the presence of Patella ferruginea that is considered as endangered. Moreover, comparison of their intraspecific variation with that of other areas might enlighten about populations connectivity and the conservation status of the analysed species.The molecular analyses performed on the samples from Oran's coasts, confirmed the presence of Patella ferruginea, P. rustica and P. caerulea, all of which shared haplotypes with other Mediterranean localities previously analysed. The intraspecific differentiation was limited, with the exception of P. rustica, which showed the greatest diversity, while P. ferruginea, the most endangered species, showed the lowest.
Le cancer colorectal est le troisième cancer dans le monde chez les deux sexes confondus. Quatre cents mille décès par cancer colorectal sont enregistrés chaque année. Ce type de cancer constitue de plus en plus un problème majeur de santé publique en Algérie. Notre travail repose sur une étude rétrospective dans le but de déterminer les cas de cancer colorectal à travers l'Ouest algérien. L'étude épidémiologique a été réalisée sur une période allant de 2000 à 2006. L'échantillonnage comporte 501 patients atteints de cancer du côlon (272 hommes, soit 54 % et 229 femmes, soit 46 %). Les résultats obtenus ont révélé une légère pré-dominance masculine avec un sex-ratio de 1,2, une fréquence élevée de l'atteinte maligne du côlon gauche (61,8 %) par rapport au côlon droit (38,2 %), respectivement. Selon la classification de Dukes, 58 % des patients présentent des tumeurs aux stades C et D. En conclusion, le type côlon gauche domine dans les deux sexes par rapport à la localisation du côlon droit et cela au niveau des différentes wilayas (Oran, Sidi-Bel-Abbes, Mascara, Ain-Temouchent et Relizane). Les résultats obtenus à l'issue de cette étude nous renseignent seulement sur la situation épidémiologique du cancer du côlon à travers l'Ouest algérien. À cet effet, il serait fort intéressant de réaliser une enquête nutritionnelle afin de déterminer le rôle important de l'alimentation dans l'étiologie de ce type de cancer.
Mots clés Cancer du côlon · Épidémiologie · Prévention primaireAbstract Colorectal cancer is the world's third most common cancer, when both sexes are considered together. 400,000 deaths from colorectal cancer are recorded every year. This type of cancer is an increasingly significant problem for public health in Algeria. The aim of our work, which took the form of a retrospective study, was to determine the number of cases of colorectal cancer in western Algeria. The epidemiological study took place between 2000 and 2006. The sample included 501 patients with colon cancer (272 men or 54% and 229 women or 46%). The results obtained showed a slight masculine predominance with a sex ratio of 1.2, and a higher rate of malignancy in the left colon (61.8%) in comparison with the right colon (38.2%). According to Dukes classification, 58% of patients presented tumours in C and D stages. In conclusion, cancer of the left colon was more common in both sexes in comparison with localisation in the right colon, in all the various wilayas (Oran, Sidi-Bel-Abbes, Mascara, Ain-Temouchent and Relizane). The results of this study only tell us about the epidemiological situation concerning colon cancer in western Algeria. A study of nutrition in this part of Algeria might well give an interesting insight into the considerable effect of diet in the etiology of this type of cancer.
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